After Ruffian, NYC, September 2012.
A simple way to dress up a classic white shirt + denim shorts: add a brightly coloured scarf and pretty pendant. 
Recreate her look (kind of):
Scarf: Tory Burch Carlye scarf,  Tolani Kauai floral scarf, Dolce & Gabbana printed silk scarf, Temps des Reves Santa Cruz scarf, Pieces Maj Tassel scarf, or Front Row Society Grainsfield scarf
White shirt: MM6 Maison Martin Margiela Dolman button up blouse, Equipment Reese cotton-poplin shirt, MiH Jeans longline shirt, Soft Joie Pearl blouse or Splendid soft shirt
Denim shorts: Paige Denim Jimmy Jimmy shorts,  MiH Jane high rise shorts, Victoria Beckham Denim slouched shorts, or Topshop Moto vintage denim hotpants
Pendant: Aurelie Bidermann 18 karat gold-dipped feather necklace,  Alex Munroe Chrysanthemum leaf pendant, Jennifer Meyer rose gold leaf pendant, Johnny Loves Rosie leaf pendant or Marie Todd modern leaf pendant necklace